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Product data
SQFlex
Dry-running protection
The SQF pump is protected against dry running in order
to prevent damage to the pump. The dry-running
protection is activated by a water level electrode placed
on the motor cable 12 - 24 inches above the pump
12 - 24 in
depending on the pump type.
The water level electrode measures the contact resis-
tance to the motor sleeve through the water. When the
water level falls below the water level electrode the
pump will be cut out. The pump will automatically cut in
again 5 min. after the water level is above the water
level electrode.
High efficiency
The MSF 3 motor is a permanent-magnet motor (PM
motor) featuring a higher efficiency within the power
range compared to a conventional asyncronous motor.
In addition to this the segmented motor stator contrib-
utes considerably to the high efficiency.
The MSF 3 motor is characterized by a high locked-
12 - 24 in
rotor torque even at low power supply.
Over- and undervoltage protection
Overvoltage and undervoltage may occur in the case of
unstable voltage supply or a faulty installation.
The pump will be cut out if voltage falls outside the
permissible voltage range. The motor is automatically
cut in again when the voltage is again within the permis-
sible voltage range. Therefore no extra protection relay
is needed.
Note: The MSF 3 motor is protected against transients
from the the voltage supply according to IEC 60664-1
"overvoltage category III" (4 kV). In areas with high
lightning intensity, external lightning protection is
recommended.
7
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